WO2015192266A1 - Drive circuit of light emitting diode having low flicker and high power - Google Patents

Drive circuit of light emitting diode having low flicker and high power Download PDF

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Publication number
WO2015192266A1
WO2015192266A1 PCT/CN2014/000593 CN2014000593W WO2015192266A1 WO 2015192266 A1 WO2015192266 A1 WO 2015192266A1 CN 2014000593 W CN2014000593 W CN 2014000593W WO 2015192266 A1 WO2015192266 A1 WO 2015192266A1
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Prior art keywords
led
storage capacitor
emitting diode
linear
light emitting
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PCT/CN2014/000593
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French (fr)
Chinese (zh)
Inventor
朱弘琦
沈毓仁
Original Assignee
钰瀚科技股份有限公司
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Priority to PCT/CN2014/000593 priority Critical patent/WO2015192266A1/en
Publication of WO2015192266A1 publication Critical patent/WO2015192266A1/en

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/48—Details of LED load circuits with an active control inside an LED matrix having LEDs organised in strings and incorporating parallel shunting devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V23/00—Arrangement of electric circuit elements in or on lighting devices
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/355—Power factor correction [PFC]; Reactive power compensation
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/36—Circuits for reducing or suppressing harmonics, ripples or electromagnetic interferences [EMI]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H05B45/59—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits for reducing or suppressing flicker or glow effects

Definitions

  • the present invention relates to light-emitting diode (LED)-based lighting devices, and more particularly to a light-emitting diode-based lighting device having low light flicker and high power factor. Background technique
  • LEDs Light-emitting diodes
  • LEDs are semiconductor-based light sources that are often used in low-energy meters and appliances, and the use of light-emitting diodes in various lighting devices is becoming more common.
  • high brightness LEDs have been widely used in traffic lights, vehicle lights, and brake lights.
  • lighting devices using high voltage LED strings have also been developed to replace conventional white heat bulbs and fluorescent bulbs.
  • a plurality of LEDs are usually connected in series to form an LED-based illumination unit, and a plurality of LED-based illumination units can be further connected in series to form an illumination.
  • the operating voltage required for each illuminator is usually determined by the forward voltage of the LEDs in the lighting unit, how many LEDs are in each lighting unit, how each lighting unit is connected to each other, and each lighting How the unit receives voltage from the power supply in the lighting unit.
  • Figure 1 shows a conventional LED-based illumination unit having a linear drive circuit 102.
  • the LED-based illumination unit includes a plurality of series-connected LED segments 110, 120 that are controlled by the linear drive circuit 102.
  • Figure 1 shows only two LED segments 110, 120.
  • Each of the LED segments includes one or more LEDs 103 connected in series, and a rectified AC power source 101 supplies power to the LED-based lighting unit.
  • the linear driving circuit 102 controls the number of LED segments that are turned on according to the input rectified AC voltage. Therefore, the illumination brightness based on the LED lighting unit is proportional to the rectified voltage value of the rectified AC power output.
  • the illumination brightness based on the illumination unit of the LED varies with the change of the input AC voltage, because the illumination brightness changes greatly from zero to the highest value, resulting in a high brightness change and flashing of the light. Since the rectified AC voltage output is unregulated, the linear drive circuit 102 is simple and inexpensive. In order to reduce the change in illumination brightness, as shown in FIG.
  • the LED-based illumination unit may be coupled to a storage capacitor 301 to regulate the rectified AC voltage output to form a DC voltage that is less variable.
  • Figure 3 also shows the input AC voltage value and the adjusted DC voltage value, as well as the illumination brightness based on the LED lighting unit. Based on the significant increase in the minimum brightness of the LED lighting unit, the change in illumination brightness is also greatly reduced.
  • the alternating current drives the LED and also charges the storage capacitor.
  • the storage capacitor supplies the LED current. It can be seen from the waveform of the current flowing. Because of the sharp increase and linear decrease of the alternating current, the waveform contains a high degree of harmonic distortion, which also causes a low power factor of the LED lighting unit. Summary of the invention
  • the invention provides a light-emitting diode-based lighting device with low-light flicker and high power factor. Therefore, the lighting device of the present invention supplies power from a rectified AC power source, and cooperates with at least one of the light-emitting diode and the storage capacitor in the lighting device. The charging path between them to reduce the change in illumination brightness and reduce power consumption.
  • the LED-based illumination device includes a rectified AC power source, the rectified output of which is coupled to a storage capacitor via a switching element, and a plurality of LED segments under control of the linear drive circuit. And at least one charging path between the LED segment and the storage capacitor.
  • the present invention can improve the preferred embodiment described above by connecting at least one controllable linear LED drive unit in parallel with the storage capacitor.
  • the controllable linear LED driving unit can be turned on to increase the brightness of the illumination device and reduce the flicker of the light.
  • each charging path can be connected to the positive or negative end of a light emitting diode in the LED segment.
  • Each charging path can be formed by a variable current source or by a current controller in series with a switch.
  • Multiple charging paths can be connected to a shared current controller A parallel switch, which is connected to the positive or negative end of the LED in the LED segment
  • FIG. 1 shows a conventional LED-based illumination unit with a linear drive circuit
  • FIG. 2 shows the input AC voltage value and illumination brightness of the conventional illumination unit of FIG. 1
  • FIG. 3 shows a conventional LED-based LED with a storage capacitor.
  • the lighting unit as well as its input AC voltage value, the adjusted DC voltage value, and the illumination housing degree;
  • Figure 4 shows the input AC voltage value and the AC current value of the conventional lighting unit of Figure 3;
  • Figure 5 shows the charging, maintaining and discharging phases of the LED-based lighting device of the present invention powered by a rectified AC power source;
  • FIG. 6 shows a block diagram of an LED-based illumination device having low light flicker and high power factor in accordance with a preferred embodiment of the present invention
  • Figure 7 shows that the storage capacitor of the lighting device of Figure 6 is connected in parallel with at least one controllable linear LED driving unit to balance the reduction of light flicker and increase power factor;
  • Figures 8(A) and 8(B) show examples of two linear light-emitting diode drive units;
  • Figure 9 shows an evolution based on the preferred embodiment of the present invention shown in Figure 6, with low light flicker and high power factor based a block diagram of a lighting device of a light emitting diode;
  • Figure 10 shows the parallel connection of the storage capacitor of the illumination device of Figure 9 to at least one controllable linear LED drive unit to balance light reduction and power increase.
  • the present invention provides a circuit for charging a storage capacitor when the voltage of the input AC power source approaches a sharp peak.
  • Figure 5 shows the charging, maintaining and discharging phases of an LED-based lighting device powered by a rectified AC power source.
  • the charging phase occurs when the input AC voltage has a higher voltage, and the charging current of the storage capacitor can be controlled to reduce harmonic distortion.
  • the AC current drives the LED and charges the storage capacitor.
  • the storage capacitor supplies the LED current.
  • the sustain phase the storage capacitor is neither charged nor discharged.
  • the maintenance phase is for the more effective control of the power factor and is also optional.
  • Figure 6 shows a block diagram of an LED-based illumination device having low light blinking and high power factor in accordance with a preferred embodiment of the present invention.
  • the apparatus includes a plurality of LED illumination segments 610, 620 in series controlled by a linear drive circuit 602.
  • Figure 6 shows only two LED segments 610, 620, each of which includes one or more LEDs 603 in series, and a rectified AC power source 601 supplies power to the LED-based illumination device.
  • the output of the rectified AC power source 601 is coupled to the positive terminal of a leading LED 603 in the leading LED segment.
  • a switching element 604 connects the output of the rectified AC power source 601 to the storage capacitor 606.
  • the LED-based illumination device in turn includes at least one variable current source 605 coupled between a light emitting diode and a storage capacitor 606.
  • Each variable current source 605 forms a charging path for the storage capacitor 606. It should be noted that each charging path can be connected to the positive or negative end of the LED 603, and the switching element 604 can be a passive switch or an active switch.
  • a diode as shown in FIG. 6 can be used as the switching element 604. When the voltage of the storage capacitor 606 is higher than the output voltage of the rectified AC power source 601, the diode 604 is turned on to allow the storage capacitor 606 to supply current to the light emitting diode.
  • a controller 607 controls the three variable current sources 605.
  • These charging paths can be used to control the charging current of the storage capacitor 606 to extend the charging time to increase the power factor. Since the AC voltage value varies during the charging phase, the optimum charging path must be selected to reduce the power consumption due to charging.
  • FIG. 7 presents a modified embodiment in which at least one controllable linear LED drive unit is coupled in parallel with storage capacitor 606 to improve the balance between reduced light flicker and increased power factor.
  • Each of the controllable linear LED driving units is formed by a linear LED driving unit 706 connected in series with a switch 707.
  • the linear LED driving unit 706 can be turned on when the instantaneous brightness of the LED 603 is insufficient. Therefore, the discharge phase can be shortened, thereby increasing the power factor. In addition to being turned on during the discharge phase, the linear LED drive unit 706 can also be used to produce multi-phase illumination brightness.
  • the linear light emitting diode drive unit includes a plurality of light emitting diode segments 801 in series with a current controller 803.
  • Each of the LED segments 801 includes one or more light emitting diodes. For simplicity, only one light emitting diode is shown in the LED segment 801.
  • Each of the LED segments 801 has a corresponding switch 802 connected from its positive terminal to a current controller 803.
  • the linear LED drive unit of Figure 8 (B) also includes a plurality of LED segments 811 in series with a current controller 813. Each of the LED segments 811 has a corresponding switch 812 in parallel with the LED segment 811.
  • the corresponding switches 802, 812 described above are optional, and their states are determined by the voltage difference between the voltage Vp at the positive terminal and the voltage Vn at the negative terminal.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

An illumination device based on a light emitting diode, comprising: a rectification alternating current power supply (601) connecting a rectification output to a storage capacitor (606) via a switch element (604); a plurality of light emitting diode segments (610, 620) controlled by a linear drive circuit (602); and at least one charging path connected between the plurality of light emitting diode segments (610, 620) and the storage capacitor (606). One or more controllable linear light emitting diode drive units (706, 707) are connected to the storage capacitor (606) in parallel to provide balance between reducing light flicker and increasing power.

Description

低闪烁和髙功率因素的发光二极管的驱动电路 技术领域  Driving circuit of light-emitting diode with low flicker and 髙 power factor
本发明是有关基于发光二极管 （LED) 的照明装置， 尤其是一种具有低 灯光闪烁及高功率因子的基于发光二极管的照明设备的驱动装置。 背景技术  The present invention relates to light-emitting diode (LED)-based lighting devices, and more particularly to a light-emitting diode-based lighting device having low light flicker and high power factor. Background technique
发光二极管 （LED) 是一种基于半导体的光源， 经常被应用在低耗电仪 表和家电的指示器，应用发光二极管在各种照明装置也己越来越普遍。例如， 高明亮度的发光二极管已被广泛用于交通信号灯、车辆指示灯、以及剎车灯。 近年来， 使用高电压的发光二极管串的照明设备也被开发来取代传统的白热 灯泡和荧光灯泡。  Light-emitting diodes (LEDs) are semiconductor-based light sources that are often used in low-energy meters and appliances, and the use of light-emitting diodes in various lighting devices is becoming more common. For example, high brightness LEDs have been widely used in traffic lights, vehicle lights, and brake lights. In recent years, lighting devices using high voltage LED strings have also been developed to replace conventional white heat bulbs and fluorescent bulbs.
为了提高基于发光二极管的照明装置的亮度， 通常是将多个发光二极管 串联在一起， 形成一个基于发光二极管的照明单元， 而且多个基于发光二极 管的照明单元可以更进一步串联在一起， 形成一个照明装置。 每个照明装置 所需要的工作电压， 通常是取决于照明单元里的发光二极管的正向电压， 每 个照明单元里有多少个发光二极管， 每个照明单元是如何相互连接的， 以及 每个照明单元在照明装置里是如何接收来自电源的电压。  In order to increase the brightness of the LED-based illumination device, a plurality of LEDs are usually connected in series to form an LED-based illumination unit, and a plurality of LED-based illumination units can be further connected in series to form an illumination. Device. The operating voltage required for each illuminator is usually determined by the forward voltage of the LEDs in the lighting unit, how many LEDs are in each lighting unit, how each lighting unit is connected to each other, and each lighting How the unit receives voltage from the power supply in the lighting unit.
图 1 显示一传统的具有线性驱动电路 102 的基于发光二极管的照明单 元。 该基于发光二极管的照明单元包含多个串联的发光二极管段 110、 120， 受控于该线性驱动电路 102。 为了简明， 图 1只显示两个发光二极管段 110、 120。每一个发光二极管段包含一或多个串联的发光二极管 103， 一整流的交 流电源 101供给电力给该基于发光二极管的照明单元。  Figure 1 shows a conventional LED-based illumination unit having a linear drive circuit 102. The LED-based illumination unit includes a plurality of series-connected LED segments 110, 120 that are controlled by the linear drive circuit 102. For simplicity, Figure 1 shows only two LED segments 110, 120. Each of the LED segments includes one or more LEDs 103 connected in series, and a rectified AC power source 101 supplies power to the LED-based lighting unit.
图 2显示该基于发光二极管照明单元的输入交流电压值以及照明亮度， 线性驱动电路 102根据输入的整流的交流电压， 而控制被导通的发光二极管 段数。 因此， 基于发光二极管照明单元的照明亮度与整流的交流电源输出的 整流电压值成比例。 从图 2可看出， 基于发光二极管照明单元的照明亮度， 随着输入交流电压的变化而变动， 因为照明亮度从零到最高值间巨大的变 化， 造成高度的亮度变化和灯光闪烁。 因为整流的交流电压输出未经调节， 线性驱动电路 102简单而且价廉。 为了降低照明亮度的变化， 如图 3所示， 基于发光二极管的照明单元可 加入一储存电容器 301， 来调节整流的交流电压输出， 以形成变动较少的直 流电压。 图 3也显示出输入交流电压值和调节后的直流电压值， 以及基于发 光二极管照明单元的照明亮度。基于发光二极管照明单元的最低亮度显著的 增加， 照明亮度的变化也大大的减低了。 2 shows the input AC voltage value and the illumination brightness based on the LED lighting unit, and the linear driving circuit 102 controls the number of LED segments that are turned on according to the input rectified AC voltage. Therefore, the illumination brightness based on the LED lighting unit is proportional to the rectified voltage value of the rectified AC power output. As can be seen from Fig. 2, the illumination brightness based on the illumination unit of the LED varies with the change of the input AC voltage, because the illumination brightness changes greatly from zero to the highest value, resulting in a high brightness change and flashing of the light. Since the rectified AC voltage output is unregulated, the linear drive circuit 102 is simple and inexpensive. In order to reduce the change in illumination brightness, as shown in FIG. 3, the LED-based illumination unit may be coupled to a storage capacitor 301 to regulate the rectified AC voltage output to form a DC voltage that is less variable. Figure 3 also shows the input AC voltage value and the adjusted DC voltage value, as well as the illumination brightness based on the LED lighting unit. Based on the significant increase in the minimum brightness of the LED lighting unit, the change in illumination brightness is also greatly reduced.
在图 3显示的传统基于发光二极管的照明单元， 其中最大的交流电流并 不是发生在输入的交流电压达到最高值的时候。 图 4显示出输入交流电压值 和交流电流值， 图中可看出， 交流电流突然增高以开始储存电容器的充电阶 段， 然后再线性的降低到储存电容器的放电阶段。  In the conventional LED-based lighting unit shown in Figure 3, the maximum AC current does not occur when the input AC voltage reaches its maximum value. Figure 4 shows the input AC voltage and AC current values. It can be seen that the AC current suddenly increases to begin the storage phase of the capacitor and then linearly decreases to the discharge phase of the storage capacitor.
在充电阶段中， 交流电流驱动发光二极管， 也对储存电容器充电。 在放 电阶段中， 储存电容器则供给发光二极管电流。 从 ^流电流的波形可看出，. 因为交流电流的急剧增加和线性降低， 波形中含有高度的谐波失真， 也造成 发光二极管照明单元的低功率因子。 发明内容  During the charging phase, the alternating current drives the LED and also charges the storage capacitor. In the discharge phase, the storage capacitor supplies the LED current. It can be seen from the waveform of the current flowing. Because of the sharp increase and linear decrease of the alternating current, the waveform contains a high degree of harmonic distortion, which also causes a low power factor of the LED lighting unit. Summary of the invention
本发明提供一低灯光闪烁及高功率因素的基于发光二极管的照明装置， 因此本发明的照明装置， 是由整流的交流电源供给电力， 并配合照明装置中 至少一个介于一发光二极管和储存电容器间的充电路径， 来降低照明亮度的 变化以及减少功率耗损。  The invention provides a light-emitting diode-based lighting device with low-light flicker and high power factor. Therefore, the lighting device of the present invention supplies power from a rectified AC power source, and cooperates with at least one of the light-emitting diode and the storage capacitor in the lighting device. The charging path between them to reduce the change in illumination brightness and reduce power consumption.
本发明的一优选实施例中， 基于发光二极管的照明装置， 包含一整流的 交流电源， 其整流输出经由一幵关元件连接到一储存电容器， 一线性驱动电 路控制下的多个发光二极管段， 和至少一个介于发光二极管段和储存电容器 间的充电路径。  In a preferred embodiment of the present invention, the LED-based illumination device includes a rectified AC power source, the rectified output of which is coupled to a storage capacitor via a switching element, and a plurality of LED segments under control of the linear drive circuit. And at least one charging path between the LED segment and the storage capacitor.
为了在降低灯光闪烁和提高功率因素间达成平衡， 本发明可在储存电容 器并联至少一可控制的线性发光二极管驱动单元， 来改良上述优选实施例。 当以线性驱动电路控制的发光二极管段产生的瞬间亮度不足时， 可控制的线 性发光二极管驱动单元可被导通来增加照明装置的亮度和降低灯光闪烁。  In order to strike a balance between reducing light flicker and increasing power factor, the present invention can improve the preferred embodiment described above by connecting at least one controllable linear LED drive unit in parallel with the storage capacitor. When the instantaneous luminance generated by the LED segments controlled by the linear driving circuit is insufficient, the controllable linear LED driving unit can be turned on to increase the brightness of the illumination device and reduce the flicker of the light.
根据本发明， 每一个充电路径可以连接在发光二极管段里的一发光二极 管的正端或负端。 每一个充电路径可以由一可变电流源来形成， 也可由一电 流控制器串联一开关来形成。 多个充电路径可以一共享的电流控制器连接多 个并联的开关， 再各别连接到发光二极管段里的发光二极管的正端或负端 附图说明 According to the invention, each charging path can be connected to the positive or negative end of a light emitting diode in the LED segment. Each charging path can be formed by a variable current source or by a current controller in series with a switch. Multiple charging paths can be connected to a shared current controller A parallel switch, which is connected to the positive or negative end of the LED in the LED segment
图 1显示一传统的具有线性驱动电路的基于发光二极管的照明单元； 图 2显示图 1中的传统照明单元的输入交流电压值以及照明亮度； 图 3显示加入一储存电容器的传统式基于发光二极管的照明单元， 以及 其输入交流电压值， 调节后的直流电压值， 和照明壳度；  1 shows a conventional LED-based illumination unit with a linear drive circuit; FIG. 2 shows the input AC voltage value and illumination brightness of the conventional illumination unit of FIG. 1; FIG. 3 shows a conventional LED-based LED with a storage capacitor. The lighting unit, as well as its input AC voltage value, the adjusted DC voltage value, and the illumination housing degree;
图 4显示出图 3的传统照明单元的输入交流电压值和交流电流值； 图 5显示由整流的交流电源供给电力的本发明的基于发光二极管的照明 装置的充电， 维持及放电阶段；  Figure 4 shows the input AC voltage value and the AC current value of the conventional lighting unit of Figure 3; Figure 5 shows the charging, maintaining and discharging phases of the LED-based lighting device of the present invention powered by a rectified AC power source;
图 6显示根据本发明的一优选实施例， 具有低灯光闪烁及高功率因素的 基于发光二极管的照明装置的方块图；  6 shows a block diagram of an LED-based illumination device having low light flicker and high power factor in accordance with a preferred embodiment of the present invention;
图 7显示将图 6中的照明装置的储存电容器并联至少一个可控制的线性 发光二极管驱动单元， 来平衡降低灯光闪烁和增加功率因素；  Figure 7 shows that the storage capacitor of the lighting device of Figure 6 is connected in parallel with at least one controllable linear LED driving unit to balance the reduction of light flicker and increase power factor;
图 8(A)、 图 8(B)显示了两种线性发光二极管驱动单元的实例； 图 9显示根据图 6显示的本发明的优选实施例而演变， 具有低灯光闪烁 及高功率因素的基于发光二极管的照明装置的方块图；  Figures 8(A) and 8(B) show examples of two linear light-emitting diode drive units; Figure 9 shows an evolution based on the preferred embodiment of the present invention shown in Figure 6, with low light flicker and high power factor based a block diagram of a lighting device of a light emitting diode;
图 10显示将图 9中的照明装置的储存电容器并联至少一个可控制的线 性发光二极管驱动单元， 来平衡降低灯光闪烁和增加功率因素。  Figure 10 shows the parallel connection of the storage capacitor of the illumination device of Figure 9 to at least one controllable linear LED drive unit to balance light reduction and power increase.
其中， 附图标记说明如下：  The reference numerals are as follows:
101、 601整流的交流电源  101, 601 rectified AC power supply
102、 602线性驱动电路  102, 602 linear drive circuit
103、 603发光二极管  103, 603 LED
110、 120、 610、 620发光二极管段  110, 120, 610, 620 LED segments
301、 606储存电容器  301, 606 storage capacitor
604二极管  604 diode
605可变电流源  605 variable current source
607控制器  607 controller
706、 1006线性发光二极管驱动单元  706, 1006 linear LED drive unit
707、 1007开关 801、 811发光二极管 707, 1007 switch 801, 811 LED
802、 812开关  802, 812 switch
803、 813电流控制器  803, 813 current controller
905开关  905 switch
908电流控制器 具体实施方式  908 current controller
本说明书提供附图， 使本发明更能进一步的被理解， 同时附图也构成本 说明书的一部分。 该附图显示出了本发明的实施例， 并与说明书一起， 用来 解释本发明的原理。  The present invention is further understood by the accompanying drawings, and the accompanying drawings also form a part of this specification. The drawings illustrate embodiments of the invention and, together with
为了提供基于发光二极管的照明装置的高功率因素， 本发明提出一可在 输入交流电源的电压接近尖峰值时为储存电容器充¾的电路。 图 5显示一由 整流的交流电源供给电力的基于发光二极管的照明装置的充电、 维持及放电 阶段。  In order to provide a high power factor for a light emitting diode based illumination device, the present invention provides a circuit for charging a storage capacitor when the voltage of the input AC power source approaches a sharp peak. Figure 5 shows the charging, maintaining and discharging phases of an LED-based lighting device powered by a rectified AC power source.
如图 5所显示， 充电阶段发生在输入的交流电压有较高的电压时， 可以 控制储存电容器的充电电流以减少谐波失真。 在充电阶段时， 交流电流驱动 发光二极管并为储存电容器充电。 在放电阶段时， 储存电容器供给发光二极 管电流。 在维持阶段时， 储存电容器既不充电也不放电。 维持阶段是为了更 有效的控制功率因素， 也是可有可无的。  As shown in Figure 5, the charging phase occurs when the input AC voltage has a higher voltage, and the charging current of the storage capacitor can be controlled to reduce harmonic distortion. During the charging phase, the AC current drives the LED and charges the storage capacitor. During the discharge phase, the storage capacitor supplies the LED current. During the sustain phase, the storage capacitor is neither charged nor discharged. The maintenance phase is for the more effective control of the power factor and is also optional.
图 6显示根据本发明的一优选实施例， 具有低灯光闪烁及高功率因素的 基于发光二极管的照明装置的方块图。 在此实施例中， 本装置包含以一线性 驱动电路 602控制的串联的多个发光二极管照明段 610、 620。 为了简明， 图 6只显示两个发光二极管段 610、 620, 每一个发光二极管段包含串联的一或 多个发光二极管 603， 一整流的交流电源 601供给电力给基于发光二极管的 照明装置。  Figure 6 shows a block diagram of an LED-based illumination device having low light blinking and high power factor in accordance with a preferred embodiment of the present invention. In this embodiment, the apparatus includes a plurality of LED illumination segments 610, 620 in series controlled by a linear drive circuit 602. For simplicity, Figure 6 shows only two LED segments 610, 620, each of which includes one or more LEDs 603 in series, and a rectified AC power source 601 supplies power to the LED-based illumination device.
如图 6所示， 整流的交流电源 601的输出连接到领先的发光二极管段里 领先的一发光二极管 603的正端。一开关元件 604将整流的交流电源 601的 输出连接到储存电容器 606。 该基于发光二极管的照明装置又包含至少一个 可变电流源 605， 连接在一发光二极管与储存电容器 606之间。 每一个可变 电流源 605为储存电容器 606形成一充电路径。 要注意的是， 每一个充电路径可接到发光二极管 603的正端或负端， 开 关元件 604可以是被动开关， 也可是主动开关。 如图 6所显示的一个二极管 可以用来当作开关元件 604。 当储存电容器 606的电压高于整流的交流电源 601的输出电压时， 该二极管 604被导通而使储存电容器 606可供给电流到 发光二极管。 As shown in Figure 6, the output of the rectified AC power source 601 is coupled to the positive terminal of a leading LED 603 in the leading LED segment. A switching element 604 connects the output of the rectified AC power source 601 to the storage capacitor 606. The LED-based illumination device in turn includes at least one variable current source 605 coupled between a light emitting diode and a storage capacitor 606. Each variable current source 605 forms a charging path for the storage capacitor 606. It should be noted that each charging path can be connected to the positive or negative end of the LED 603, and the switching element 604 can be a passive switch or an active switch. A diode as shown in FIG. 6 can be used as the switching element 604. When the voltage of the storage capacitor 606 is higher than the output voltage of the rectified AC power source 601, the diode 604 is turned on to allow the storage capacitor 606 to supply current to the light emitting diode.
如图 6所显示， 在此例中有由三个可变电流源 605各别形成的三个充电 路径， 并有一控制器 607控制该三个可变电流源 605。 这些充电路径可以用 来控制储存电容器 606的充电电流， 以延长充电的时间来增加功率因素。 因 为交流电压值在充电阶段会变动， 所以必须选择最佳的充电路径来减少因充 电所造成的功率耗损。  As shown in Fig. 6, in this example, there are three charging paths formed by three variable current sources 605, and a controller 607 controls the three variable current sources 605. These charging paths can be used to control the charging current of the storage capacitor 606 to extend the charging time to increase the power factor. Since the AC voltage value varies during the charging phase, the optimum charging path must be selected to reduce the power consumption due to charging.
可以了解到的是， 延长放电阶段会降低灯光闪烁， 而减少交流电流的波 形的谐波失真则会增加功率因素。 然而在图 6所显示的实施例中， 要平衡降 低灯光闪烁和增加功率因素是困难的。 图 7提出了一改良的实施例， 其中将 储存电容器 606上并联至少一个可控制的线性发光二极管驱动单元， 来改善 降低灯光闪烁和增加功率因素间的平衡。 每一个可控制的线性发光二极管驱 动单元， 是由一线性发光二极管驱动单元 706串联一开关 707而形成。  It can be seen that extending the discharge phase reduces the flicker of the light, while reducing the harmonic distortion of the AC current waveform increases the power factor. However, in the embodiment shown in Figure 6, it is difficult to balance the reduction of light flicker and increase power factor. Figure 7 presents a modified embodiment in which at least one controllable linear LED drive unit is coupled in parallel with storage capacitor 606 to improve the balance between reduced light flicker and increased power factor. Each of the controllable linear LED driving units is formed by a linear LED driving unit 706 connected in series with a switch 707.
在图 7所显示的改良实施例里， 当发光二极管 603所产生的瞬间亮度不 足时， 线性发光二极管驱动单元 706可被导通。 因此可以縮短放电阶段， 从 而增加功率因素。除了在放电阶段被导通之外，线性发光二极管驱动单元 706 也可用来产生多相位的照明亮度。  In the modified embodiment shown in Fig. 7, the linear LED driving unit 706 can be turned on when the instantaneous brightness of the LED 603 is insufficient. Therefore, the discharge phase can be shortened, thereby increasing the power factor. In addition to being turned on during the discharge phase, the linear LED drive unit 706 can also be used to produce multi-phase illumination brightness.
图 8显示了两种线性发光二极管驱动单元 706的实施例， 在图 8 (A) 里， 线性发光二极管驱动单元包含多个发光二极管段 801， 与一电流控制器 803串联。 每一个发光二极管段 801包含一或多个发光二极管。 为了简化， 发光二极管段 801中只显示一个发光二极管。每一个发光二极管段 801有一 相对应的开关 802， 从其正端连接到电流控制器 803。  8 shows an embodiment of two linear light emitting diode drive units 706. In FIG. 8(A), the linear light emitting diode drive unit includes a plurality of light emitting diode segments 801 in series with a current controller 803. Each of the LED segments 801 includes one or more light emitting diodes. For simplicity, only one light emitting diode is shown in the LED segment 801. Each of the LED segments 801 has a corresponding switch 802 connected from its positive terminal to a current controller 803.
图 8 (B ) 里的线性发光二极管驱动单元也包含多个发光二极管段 811， 与一电流控制器 813串联。每一个发光二极管段 811:有一相对应的开关 812， 与该发光二极管段 811并联。 上述相对应的开关 802、 812是可有可无的， 它们的状态决定于图中正端的电压 Vp与负端的电压 Vn之间的电压差。  The linear LED drive unit of Figure 8 (B) also includes a plurality of LED segments 811 in series with a current controller 813. Each of the LED segments 811 has a corresponding switch 812 in parallel with the LED segment 811. The corresponding switches 802, 812 described above are optional, and their states are determined by the voltage difference between the voltage Vp at the positive terminal and the voltage Vn at the negative terminal.
图 9显示根据图 6显示的本发明的优选实施例而演变， 具有低灯光闪烁 及高功率因素的基于发光二极管的照明装置的方块图。 从图中可看出， 图 6 里由三个可变电流源 605所组成的三个充电路径， 被三个开关 905和一个电 流控制器 908所取代。 此电流控制器 908可以是一可变电流源或是一电阻。 为了要平衡降低灯光闪烁和增加功率因素， 如图 10所示， 可以在储存电容 器 606上并联至少一个可控制的线性发光二极管驱动单元。 每一个可控制的 线性发光二极管驱动单元， 是由一线性发光二极管驱动单元 1006 串联一开 关 1007而形成。 Figure 9 shows an evolution of the preferred embodiment of the invention shown in Figure 6, with low light flashing And a block diagram of a light-emitting diode-based lighting device with high power factor. As can be seen from the figure, the three charging paths consisting of three variable current sources 605 in Figure 6 are replaced by three switches 905 and one current controller 908. The current controller 908 can be a variable current source or a resistor. In order to balance the reduction of light flicker and increase power factor, as shown in FIG. 10, at least one controllable linear light emitting diode drive unit can be connected in parallel with the storage capacitor 606. Each of the controllable linear LED driving units is formed by a linear LED driving unit 1006 connected in series with a switch 1007.
虽然以上只藉由几个实施范例来描述本发明， 然而熟悉本领域的技术人 员， 很明显的可以了解， 仍有许多未描述的变通及修改， 都在不偏离以下所 定义的本发明的权利要求范围之内。  Although the invention has been described above by way of a few embodiments, it is obvious to those skilled in the art that many modifications and modifications may be made without departing from the scope of the invention as defined below. Within the scope of the request.

Claims

权利要求 Rights request
1.一基于发光二极管的照明装置， 其特征在于， 包括： 1. A light-emitting diode-based lighting device, comprising:
一整流的交流电源， 包括一整流输出；  a rectified AC power source comprising a rectified output;
一开关元件， 有第一端连接到上述整流输出；  a switching element having a first end connected to the rectified output;
一储存电容器， 有第一端连接到上述开关元件的第二端， 以及第二端接 地；  a storage capacitor having a first end connected to the second end of the switching element and a second end grounded;
串联的多个发光二极管段， 其中每一个发光二极管段有串联的一或多个 发光二极管， 领先的一发光二极管段里领先的发光二极管有一正端连接到上 述整流输出；  a plurality of LED segments connected in series, wherein each of the LED segments has one or more LEDs connected in series, and a leading LED in the leading LED segment has a positive terminal connected to the rectified output;
一线性驱动电路， 控制上述多个发光二极管段；  a linear driving circuit for controlling the plurality of LED segments;
至少一充电路径， 连接上述多个发光二极管段里的一个发光二极管的正 端或负端到上述储存电容器的第一端； 以及  At least one charging path connecting a positive end or a negative end of one of the plurality of LED segments to the first end of the storage capacitor;
一控制器， 控制上述至少一充电路径。  A controller controls the at least one charging path.
2.如权利要求 1所述的照明装置， 其特征在于， 上述开关元件是一二极 管， 该二极管有一正端连接到上述储存电容器的第一端， 有一负端连接到上 述整流输出。  The illumination device according to claim 1, wherein said switching element is a diode having a positive terminal connected to said first end of said storage capacitor and a negative terminal connected to said rectified output.
3.如权利要求 1所述的照明装置， 其特征在于， 上述开关元件是一被动 开关元件。  The lighting device according to claim 1, wherein said switching element is a passive switching element.
4.如权利要求 1所述的照明装置， 其特征在于， 上述开关元件是一主动 开关元件。  The lighting device according to claim 1, wherein said switching element is an active switching element.
5.如权利要求 1所述的照明装置， 其特征在于， 又包括至少一可控制线 性发光二极管驱动单元， 与上述储存电容器并联， 其中每一个可控制线性发 光二极管驱动单元包含一线性发光二极管驱动单元， 与一开关串联。  5. The illumination device of claim 1 further comprising at least one controllable linear light emitting diode drive unit in parallel with said storage capacitor, wherein each controllable linear light emitting diode drive unit comprises a linear light emitting diode drive Unit, in series with a switch.
6.如权利要求 5所述的照明装置， 其特征在于， 上述线性发光二极管驱 动单元包含多个发光二极管段， 与一电流控制器串联， 其中线性发光二极管 驱动单元里除了领先的一发光二极管段之外， 每一个发光二极管段都有一相 对应的开关与其并联。  The illuminating device according to claim 5, wherein the linear LED driving unit comprises a plurality of LED segments in series with a current controller, wherein the linear LED driving unit comprises a leading LED segment. In addition, each LED segment has a corresponding switch in parallel with it.
7.如权利要求 5所述的照明装置， 其特征在于， 上述线性发光二极管驱 动单元包含多个发光二极管段， 与一电流控制器串联， 其中线性发光二极管 驱动单元里除了领先的一发光二极管段之外， 每一个发光二极管段都有一相 对应的开关连接该发光二极管段的正端到该线性发光二极管驱动单元里尾 端的一发光二极管段的负端。 The illuminating device according to claim 5, wherein the linear LED driving unit comprises a plurality of LED segments, and is connected in series with a current controller, wherein the linear LED In addition to the leading one of the LED segments, each of the LED segments has a corresponding switch connecting the positive end of the LED segment to the negative terminal of an LED segment at the end of the linear LED driver unit.
8.如权利要求 1所述的照明装置， 其特征在于， 上述至少一充电路径包 含一可变电流源。  The illumination device of claim 1, wherein said at least one charging path comprises a variable current source.
9.如权利要求 8所述的照明装置， 其特征在于， 上述可变电流源从上述 整流输出连接到上述储存电容器的第一端。  The illumination device according to claim 8, wherein said variable current source is connected from said rectified output to said first end of said storage capacitor.
10.如权利要求 1所述的照明装置， 其特征在于， 有第一可变电流源， 连 接上述领先的发光二极管的正端与上述储存电容器的第一端以形成第一充 电路径； 以及第二可变电流源， 连接上述领先的发光二极管的负端与上述储 存电容器的第一端以形成第二充电路径。  The illuminating device according to claim 1, wherein a first variable current source is connected to connect the positive end of the leading light emitting diode to the first end of the storage capacitor to form a first charging path; And a variable current source connecting the negative end of the leading LED and the first end of the storage capacitor to form a second charging path.
11.如权利要求 1所述的照明装置，其特征在于， 上述至少一充电路径包 含一电流控制器， 与一开关串联。  11. The illumination device of claim 1 wherein said at least one charging path comprises a current controller in series with a switch.
12.如权利要求 11所述的照明装置， 其特征在于， 上述电流控制器是一 可变电流源。  The illumination device according to claim 11, wherein said current controller is a variable current source.
13.如权利要求 11所述的照明装置， 其特征在于， 上述电流控制器是一 电阻。  The illumination device according to claim 11, wherein said current controller is a resistor.
14.如权利要求 11所述的照明装置， 其特征在于， 上述开关有一端连接 到上述整流输出， 而上述电流控制器有一端连接到上述储存电容器的第一 端。  The illumination device according to claim 11, wherein one end of said switch is connected to said rectified output, and said current controller has one end connected to said first end of said storage capacitor.
15.如权利要求 1所述的照明装置， 其特征在于， 有第一开关， 连接上述 领先的发光二极管的正端与一电流控制器的第一端以形成第一充电路径； 以 及第二开关， 连接上述领先的发光二极管的负端与该电流控制器的第一端以 形成第二充电路径， 该电流控制器的第二端则连接到上述储存电容器的第一 端。  The lighting device of claim 1 , wherein: a first switch is connected to connect the positive end of the leading LED to a first end of a current controller to form a first charging path; and a second switch And connecting a negative end of the leading LED to the first end of the current controller to form a second charging path, and a second end of the current controller is connected to the first end of the storage capacitor.
PCT/CN2014/000593 2014-06-17 2014-06-17 Drive circuit of light emitting diode having low flicker and high power WO2015192266A1 (en)

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